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Caffeine Intake Calculator

Track your total daily caffeine intake from coffee (various strengths), tea, espresso, energy drinks, and soda. Includes safety warnings based on FDA guidelines, elimination timeline, and per-beverage breakdown.

Health

How many servings did you have today?

☕

Coffee (drip)

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☕

Espresso (shot)

Enter quantity

☕

Instant Coffee

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🫖

Black Tea

Enter quantity

🫖

Green Tea

Enter quantity

⚡

Energy Drink

Enter quantity

🥤

Cola / Soda

Enter quantity

🥤

Diet Cola

Enter quantity

Caffeine Reference Guide

Beverage	Serving	Caffeine
☕ Coffee (drip)	1 serving	40-145 mg
☕ Espresso (shot)	1 serving	63 mg
☕ Instant Coffee	1 serving	62 mg
🫖 Black Tea	1 serving	47 mg
🫖 Green Tea	1 serving	28 mg
⚡ Energy Drink	1 serving	150 mg
🥤 Cola / Soda	1 serving	34 mg
🥤 Diet Cola	1 serving	42 mg

Safe Caffeine Guidelines

FDA recommends: Up to 400 mg of caffeine per day for healthy adults — roughly 4 cups of brewed coffee.

Pregnancy: The American College of Obstetricians and Gynecologists recommends limiting to 200 mg per day during pregnancy.

Children and teens: The American Academy of Pediatrics recommends against caffeine for children and adolescents.

Sensitivity: Caffeine metabolism varies significantly between individuals due to genetics. Some people experience side effects at doses below 200 mg.

Caffeine Half-Life Explained

Caffeine has an average half-life of about 5 hours in healthy adults. This means after 5 hours, half of the caffeine is still in your system:

If you consume 200 mg at 8 AM, you still have ~100 mg at 1 PM
~50 mg at 6 PM
~25 mg at 11 PM — enough to disrupt sleep for sensitive individuals
Factors that prolong half-life: pregnancy, liver disease, oral contraceptives
Factors that shorten half-life: smoking, high altitude

Frequently Asked Questions

How much caffeine is too much?▾

The FDA recommends a maximum of 400 mg per day for healthy adults. Consuming more than 600 mg per day regularly increases the risk of insomnia, anxiety, heart palpitations, and digestive issues. Acute caffeine overdose requires consumption of ~1,000-1,500 mg in a short period.

When should I stop drinking caffeine during the day?▾

Given caffeine's 5-hour half-life, stop consuming caffeine by 12-2 PM to minimize sleep disruption. Sensitive individuals may need to stop by 10 AM. Consider your bedtime — if you sleep at 10 PM, stopping by 2 PM gives caffeine ~8 hours to mostly clear your system.

Can caffeine help with weight loss?▾

Caffeine can temporarily boost metabolism by 3-11% and enhance fat burning, especially during exercise. However, the effect diminishes with regular use as tolerance builds. Caffeine is not a substitute for proper diet and exercise for weight management.

What is the best time to drink coffee?▾

Cortisol (your natural alertness hormone) peaks shortly after waking. Drinking coffee during this peak may build tolerance faster. Waiting 1-2 hours after waking allows cortisol to naturally decrease, making caffeine more effective. Mid-morning (9-11 AM) is often the optimal window.

Does caffeine cause dehydration?▾

Moderate caffeine consumption (up to 400 mg/day) does not cause significant dehydration. While caffeine has a mild diuretic effect, the water content of coffee and tea more than compensates for it. Caffeinated beverages contribute to your daily fluid intake.

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How to Use This Tool

Use the + and - buttons or type directly to set how many servings you've had of each beverage.
For drip coffee, select the strength: light, medium, or strong.
View your total caffeine intake in mg and see which safety zone you fall into.
Check the per-beverage breakdown to see which sources contribute the most.
Review the caffeine elimination timeline to understand how long it stays in your system.
Read the reference guide and FAQs for safe caffeine consumption guidelines.

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